Attach activities to organization units to graphically assign responsibility for them. When activities are attached to an organization unit displayed in a swimlane, the organization unit name is displayed in the Organization Unit list of their property sheets.
You attach activities to an organization unit by creating them in (or moving existing ones into) the required swimlane. Alternately, you can select an organization unit name from the Organization Unit list of the activity property sheet, and click OK to attach it.
To detach activities from an organization unit, drag them outside the swimlane or select <None> in the activity property sheet.